Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 753

May 24, 201515 counties in Illinois; 5 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 24, 2015, 10:40 PM CDT for 15 counties in Illinois; 5 counties in Indiana. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: May 24, 2015, 10:40 PM CDT (03:40 UTC)
Expired: May 25, 2015, 12:15 AM CDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Champaign County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Jasper County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Shelby County, IL, Vermilion County, IL, Fountain County, IN, Parke County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN

The radar

The Lincoln radar (KILX), 129 km from the middle of the area, began a volume at 03:39 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.7 hours before the alert went out and 86 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 169 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1620 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 24, 8:41 PM CDT	Mesoscale Discussion	SPC	Alexander, Bond, Clinton, Fayette, Franklin, Jackson and 15 more	64 min

Nearby

Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Indiana, 2015 Every mesoscale discussion in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.